We are making our own board with a sama5d24 with emmc connected to sd0. We also have qspi1 ioset 2 for bootstrap (later uboot) and zimage and dt.

I'm at the point where yocto generates bootstrap and it loads my zimage and dt from qspi and starts up. Now kernel is looking for root.

We want to use ext4 file system. Yocto generates it for me, but seems like it is not the correct format for samba to load. What file type should I use here and how do I get yocto to generate it? Seems like sdimg is a good fit, but not supported natively.